sound/aoa/codecs/tas-basstreble.h

   1 /*
   2  * This file is only included exactly once!
   3  *
   4  * The tables here are derived from the tas3004 datasheet,
   5  * modulo typo corrections and some smoothing...
   6  */
   7
   8 #define TAS3004_TREBLE_MIN      0
   9 #define TAS3004_TREBLE_MAX      72
  10 #define TAS3004_BASS_MIN        0
  11 #define TAS3004_BASS_MAX        72
  12 #define TAS3004_TREBLE_ZERO     36
  13 #define TAS3004_BASS_ZERO       36
  14
  15 static u8 tas3004_treble_table[] = {
  16         150, /* -18 dB */
  17         149,
  18         148,
  19         147,
  20         146,
  21         145,
  22         144,
  23         143,
  24         142,
  25         141,
  26         140,
  27         139,
  28         138,
  29         137,
  30         136,
  31         135,
  32         134,
  33         133,
  34         132,
  35         131,
  36         130,
  37         129,
  38         128,
  39         127,
  40         126,
  41         125,
  42         124,
  43         123,
  44         122,
  45         121,
  46         120,
  47         119,
  48         118,
  49         117,
  50         116,
  51         115,
  52         114, /* 0 dB */
  53         113,
  54         112,
  55         111,
  56         109,
  57         108,
  58         107,
  59         105,
  60         104,
  61         103,
  62         101,
  63         99,
  64         98,
  65         96,
  66         93,
  67         91,
  68         89,
  69         86,
  70         83,
  71         81,
  72         77,
  73         74,
  74         71,
  75         67,
  76         63,
  77         59,
  78         54,
  79         49,
  80         44,
  81         38,
  82         32,
  83         26,
  84         19,
  85         10,
  86         4,
  87         2,
  88         1, /* +18 dB */
  89 };
  90
  91 static inline u8 tas3004_treble(int idx)
  92 {
  93         return tas3004_treble_table[idx];
  94 }
  95
  96 /* I only save the difference here to the treble table
  97  * so that the binary is smaller...
  98  * I have also ignored completely differences of
  99  * +/- 1
 100  */
 101 static s8 tas3004_bass_diff_to_treble[] = {
 102         2, /* 7 dB, offset 50 */
 103         2,
 104         2,
 105         2,
 106         2,
 107         1,
 108         2,
 109         2,
 110         2,
 111         3,
 112         4,
 113         4,
 114         5,
 115         6,
 116         7,
 117         8,
 118         9,
 119         10,
 120         11,
 121         14,
 122         13,
 123         8,
 124         1, /* 18 dB */
 125 };
 126
 127 static inline u8 tas3004_bass(int idx)
 128 {
 129         u8 result = tas3004_treble_table[idx];
 130
 131         if (idx >= 50)
 132                 result += tas3004_bass_diff_to_treble[idx-50];
 133         return result;
 134 }